EP1678656A1 - Dispositif optique de formation d une image d empreinte s digitales - Google Patents
Dispositif optique de formation d une image d empreinte s digitalesInfo
- Publication number
- EP1678656A1 EP1678656A1 EP04791522A EP04791522A EP1678656A1 EP 1678656 A1 EP1678656 A1 EP 1678656A1 EP 04791522 A EP04791522 A EP 04791522A EP 04791522 A EP04791522 A EP 04791522A EP 1678656 A1 EP1678656 A1 EP 1678656A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- face
- optical plate
- optical
- optical device
- focusing lens
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
- G02B19/0023—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors) at least one surface having optical power
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
Definitions
- the present invention relates generally to the field of fingerprinting and more particularly to improvements in optical fingerprint imaging devices. It is explicitly stated here that the invention relates exclusively to an optical device capable of forming a fingerprint image, and that it does not concern the equipment located downstream from said device for scanning / recording the image obtained, detecting the characteristic points of the fingerprints and provide information on the person concerned.
- optical imaging devices for the formation of a fingerprint image are already known.
- the document WO 01/88835 discloses a fingerprint imaging device comprising: an optical plate with: a first principal face constituting a face for affixing a finger whose image of the fingerprints is to be obtained A first converging mirror-shaped first side face and a second side face opposite the first side face and forming an exit face of the optical plate; at least one light source for illuminating the aforementioned first main face through the optical plate, a focusing lens located opposite said output face of the optical plate and having its object focal point located substantially in the focal plane of the converging mirror, and a diaphragm provided with an opening, interposed between said output face and said focusing lens and located substantially near the focusing lens.
- Fingerprint detection devices may, in particular, serve to authenticate a person so that it is authorized to perform a specific operation: in this case, the fingerprint detection device often accompanies another device that the person authenticated will be allowed to use (computer, bank machine, ).
- the space available for implantation of the fingerprint detection device is then reduced, and a fortiori the optical imaging device incorporated in this fingerprint detection device must be made in the most compact form possible, and especially with the thickness (or height) as low as possible.
- the optical imaging device has a thickness (or height) not exceeding about 5 mm.
- the imaging device described in WO 01/88835 is unsatisfactory for meeting the requirements of very small thickness, together with a good quality of the image of fingerprints obtained, required to equip fingerprint detection devices.
- an optical device for forming a fingerprint image as described above is characterized, being arranged according to the invention, in that the aforesaid first main face of the optical plate forms, with the the output face of this optical plate, an angle greater than 90 °, thanks to which the incidence of light rays on said first main face, inside the optical plate, is increased and the parasitic radiation reaching the face output is decreased, at the same time that the thickness of the optical plate can be reduced.
- the plane defined by said first main face intersects the diaphragm under the opening thereof, whereby a major part of the parasitic light transmitted from the exit face is intercepted by the diaphragm under the opening of it.
- the inclination of the first main face should not be excessive so that a substantial increase in the thickness of the optical plate does not result and it is then desirable that the inclination of said first main face be just sufficient for the aforesaid plane to intersect the diaphragm in the immediate vicinity of its opening.
- the angle of inclination of said first main face relative to a plane perpendicular to the exit face is between 2 ° and 25 °, this angle typically having preferably a value of about 10 °.
- the optical plate having third and fourth side faces respectively extending between said first and second mutually opposite side faces, said third and fourth side faces inclined towards each other from the first side face; and at least one light source is disposed facing at least one of the third and fourth side faces.
- the optical plate and the focusing lens are constituted in the form of a single piece having a slot defined by the exit face of the optical plate and the input face of the focusing lens, said slot being shaped to receive said diaphragm.
- the one-piece piece thus formed may, for example, be manufactured by molding a transparent material of optical quality, including an inexpensive synthetic material.
- downstream of the lens is provided a mirror arranged to reflect the light radiation substantially perpendicular to the optical plate.
- the optical beam reflected by the output mirror can directly attack a sensor belonging to the image processing and analysis device. fingerprints that is located downstream.
- the output of the optical beam out of the imaging device is by the second main face opposite to the first main face on which is affixed the finger, which allows to design a generally compact and as thin as desired.
- the imaging device according to the invention comprises an optical plate 1, with: a first main face 2 constituting a face for affixing a finger 3 of which it is desired obtaining an image of the fingerprints, - a first convergent mirror-shaped lateral face 4, and - a second lateral face 5, opposite to the first lateral face 4 and forming the exit face of the optical plate 1.
- the optical plate 1 also has a second main face 6, opposite the aforesaid first main face 2 and being able for example to be substantially perpendicular to the exit face 5.
- Two other lateral faces 8 (not visible in FIG. 1), which will be discussed later, extend respectively between the two aforesaid first and second side faces 4, 5.
- the imaging device further comprises at least one light source 7 for illuminating the aforesaid first main surface 2 to be trapped.
- the light source could be arranged under the optical plate 1, facing the second main face 6 thereof; however such an arrangement would lead to increasing the thickness of the imaging device.
- the imaging device further comprises a focusing lens 9 (for example a converging lens) disposed facing the exit face 5 of the optical plate 1.
- the focusing lens 9 has its object focal point located substantially in the focal plane Finally, a diaphragm 10 provided with an opening 11 is interposed between said outlet face 5 of the optical plate 1 and the focusing lens 9, being situated substantially close to the focusing lens 9.
- the axis 12 of the beam reflected by the converging mirror 4 is substantially perpendicular to the exit face 5, and the opening 11 of the diaphragm 10 and the focusing lens 9 are arranged coaxially with this axis 12.
- the first main face 2 of the optical plate 1 forms, with the exit face 5, an angle ⁇ greater than 90 ° so that the incidence of light rays emitted by the source or sources 7 on this main face 2 is increased and more close to a normal, which leads to a reduction of parasitic radiation (diffuse light) reaching the exit face 5.
- the thickness of the optical plate can be reduced in relation to the thickness of an anterior optical plate for the same level of spurious radiation.
- the plane P defined by the first main face 2 intersects the diaphragm 10 outside the opening 11 thereof, and more specifically, taking into account the relative positions of the face 2 and the diaphragm 10, that the plane P intersects the diaphragm 10 under the opening 11.
- an excessive inclination of the face 2 would not make it possible to give the optical plate a thickness as small as desired It is therefore necessary to limit the inclination of the face 2 to a value just sufficient for the above plane P intersects the diaphragm 10 certainly under the opening 11 thereof, but in the immediate vicinity of this opening.
- the aforementioned angle is between 2 ° and 25 °, and in a typical embodiment it is about 10 °.
- FIG. 4 illustrates an example of implantation of the imaging device according to the invention in a fingerprint detection apparatus.
- the imaging device arranged according to the invention illustrated in its configuration as distinct components according to FIG.
- the imaging device designated as a whole by the reference 18 in FIG. 4, can be arranged with a very small thickness h, of the order of 5 mm, in accordance with the required requirements. for its implementation in the fingerprint detection apparatus, at the same time as it is capable of delivering a good quality image fingerprints.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Human Computer Interaction (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
- Lenses (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL04791522T PL1678656T3 (pl) | 2003-10-17 | 2004-10-13 | Urządzenie optyczne do tworzenia obrazu odcisków palców |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0312158A FR2861200B1 (fr) | 2003-10-17 | 2003-10-17 | Dispositif optique de formation d'une image d'empreintes digitales |
PCT/FR2004/002609 WO2005038698A1 (fr) | 2003-10-17 | 2004-10-13 | Dispositif optique de formation d'une image d'empreintes digitales |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1678656A1 true EP1678656A1 (fr) | 2006-07-12 |
EP1678656B1 EP1678656B1 (fr) | 2007-01-31 |
Family
ID=34385246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04791522A Expired - Lifetime EP1678656B1 (fr) | 2003-10-17 | 2004-10-13 | Dispositif optique de formation d'une image d empreinte digitale |
Country Status (9)
Country | Link |
---|---|
US (1) | US7580550B2 (fr) |
EP (1) | EP1678656B1 (fr) |
CN (1) | CN100394433C (fr) |
DE (1) | DE602004004599T2 (fr) |
ES (1) | ES2281842T3 (fr) |
FR (1) | FR2861200B1 (fr) |
PL (1) | PL1678656T3 (fr) |
PT (1) | PT1678656E (fr) |
WO (1) | WO2005038698A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100760061B1 (ko) * | 2005-07-25 | 2007-09-18 | 추안 리앙 인더스트리얼 코., 엘티디. | 지문 패턴을 인식하도록 전반사를 이용하는 지문 인식조립체 |
US20080226146A1 (en) * | 2005-09-16 | 2008-09-18 | Farimex S.A. | Biometric Detector and Identity Control Device |
FR2897966B1 (fr) | 2006-02-24 | 2008-05-16 | Sagem Defense Securite | Biodetecteur sans contact |
US20120121143A1 (en) * | 2010-11-11 | 2012-05-17 | Hung-Te Lee | Fingerprint imaging system |
CN103632128A (zh) * | 2012-08-24 | 2014-03-12 | 成都方程式电子有限公司 | 扁平指纹采集器 |
TWI609334B (zh) * | 2012-11-02 | 2017-12-21 | 金佶科技股份有限公司 | 指紋取像系統 |
WO2020006706A1 (fr) * | 2018-07-04 | 2020-01-09 | 深圳市汇顶科技股份有限公司 | Module d'empreinte digitale et dispositif électronique |
FR3085079B1 (fr) | 2018-08-20 | 2021-09-24 | Idemia Identity & Security France | Authentification par indice optique |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI893028A (fi) * | 1988-06-23 | 1989-12-24 | Fujitsu Ltd | Anordning foer avkaenning av data fraon en ojaemn yta. |
JP2773750B2 (ja) * | 1988-11-15 | 1998-07-09 | 富士通株式会社 | 指紋像入力装置 |
EP0359554B1 (fr) * | 1988-09-16 | 1994-11-17 | Fujitsu Limited | Système d'objets biologiques et système de comparaison d'empreintes digitales utilisant ce système |
US5761330A (en) * | 1995-06-07 | 1998-06-02 | Mytec Technologies, Inc. | Hybrid optical-digital method and apparatus for fingerprint verification |
US6191410B1 (en) * | 1999-06-23 | 2001-02-20 | International Automated Systems, Inc | Fingerprint sensing apparatus and method |
US6324020B1 (en) * | 1999-08-04 | 2001-11-27 | Secugen Corporation | Method and apparatus for reduction of trapezoidal distortion and improvement of image sharpness in an optical image capturing system |
US6496630B2 (en) * | 2000-03-10 | 2002-12-17 | Omron Corporation | Fingerprint recognition device and fingerprint reading window construction |
WO2001088835A1 (fr) * | 2000-05-15 | 2001-11-22 | Identix Incorporated | Systeme de presentation d'empreintes digitales |
US6956608B1 (en) * | 2000-08-11 | 2005-10-18 | Identix Incorporated | Fingerprint imaging device including an optical plate having microreflectors |
-
2003
- 2003-10-17 FR FR0312158A patent/FR2861200B1/fr not_active Expired - Fee Related
-
2004
- 2004-10-13 US US10/574,456 patent/US7580550B2/en active Active
- 2004-10-13 DE DE602004004599T patent/DE602004004599T2/de not_active Expired - Lifetime
- 2004-10-13 PT PT04791522T patent/PT1678656E/pt unknown
- 2004-10-13 EP EP04791522A patent/EP1678656B1/fr not_active Expired - Lifetime
- 2004-10-13 CN CNB2004800305644A patent/CN100394433C/zh not_active Expired - Fee Related
- 2004-10-13 WO PCT/FR2004/002609 patent/WO2005038698A1/fr active IP Right Grant
- 2004-10-13 PL PL04791522T patent/PL1678656T3/pl unknown
- 2004-10-13 ES ES04791522T patent/ES2281842T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO2005038698A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005038698A1 (fr) | 2005-04-28 |
PL1678656T3 (pl) | 2007-06-29 |
DE602004004599T2 (de) | 2007-11-15 |
US20070014524A1 (en) | 2007-01-18 |
CN1867927A (zh) | 2006-11-22 |
EP1678656B1 (fr) | 2007-01-31 |
ES2281842T3 (es) | 2007-10-01 |
PT1678656E (pt) | 2007-05-31 |
FR2861200A1 (fr) | 2005-04-22 |
DE602004004599D1 (de) | 2007-03-22 |
FR2861200B1 (fr) | 2006-01-20 |
CN100394433C (zh) | 2008-06-11 |
US7580550B2 (en) | 2009-08-25 |
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